From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 764663B9DA2; Sat, 11 Apr 2026 16:49:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775926168; cv=none; b=YswI/mMMpmrGcJcVEyyvXiebuotL8pXSuqtwqWJ1Ye0entLJkA4XJs7+7vZKEzh3q/lLMRtIOCbty+RR73OIfu53MLmBbJokOe9KQzTeG0q3vUolEveSFVfJDohTG87lYOYLv78cAI+s8ZuD8GY1yGGEdmJb615XRuRFjeTzBUI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775926168; c=relaxed/simple; bh=sGB3rlU6Wo00dN98XUbINMBktp7aAzb0KnYDPk0v+Qg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gWCoNYd2RQdADMahFhqOjjS+t84mDpIffeCJyiIhIMqoRo/+3Rbiid0cPnDql3KXdD9ZzgMX1xA1CdE6KueV+kiTkLNphTarCq3mgyhIwVSLMzqrRiZ6VvXoQSrmYWl4LmBgFMrTnTfRLa6ccbe8tdX78eaSzcCPs0a4YrdILZk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ao04Vg1p; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ao04Vg1p" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D379CC2BC87; Sat, 11 Apr 2026 16:49:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1775926168; bh=sGB3rlU6Wo00dN98XUbINMBktp7aAzb0KnYDPk0v+Qg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ao04Vg1pC2h7ahiOQjT5272QwRmCO58ckfIBxt4p7h35inI0qqSWlB/FHLkp6VLWJ HqqbbOCVpzEKB8VyRFCoEm2DLqVcD8jgSsfit3YEpuQBJKHtTQuXDIwlvCSYlvBIq3 V76NJZqFhdUQ+fWlO7UaXdHthlZrZldiOkFCDiQqqPygTE8d9i/OUz4rHAgG9VJlOA BoGKU9Uo0cKFi+cZaNBmc8hfLqdMhgGVZOHAsuRg3oQRZDFCd3Kojn8eLWPRuvu+IO qFw0Qog0Hee1XV/buZB9ov2k0KbGRvWVTSwnlE3sFyhBnjbloxwXX9yglwjaT4P32c fDI1dvk1SBo7g== From: SeongJae Park To: Cc: SeongJae Park , Andrew Morton , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v5.1 04/11] mm/damon/sysfs-schemes: implement fail_charge_{num,denom} files Date: Sat, 11 Apr 2026 09:48:57 -0700 Message-ID: <20260411164908.77189-5-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260411164908.77189-1-sj@kernel.org> References: <20260411164908.77189-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Implement the user-space ABI for the DAMOS action failed region quota-charge ratio setup. For this, add two new sysfs files under the DAMON sysfs interface for DAMOS quotas. Names of the files are fail_charge_num and fail_charge_denom, and work for reading and setting the numerator and denominator of the failed regions charge ratio. Signed-off-by: SeongJae Park --- mm/damon/sysfs-schemes.c | 54 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index aa08a8f885fb0..edec3566bcd11 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -1489,6 +1489,8 @@ struct damon_sysfs_quotas { unsigned long reset_interval_ms; unsigned long effective_sz; /* Effective size quota in bytes */ enum damos_quota_goal_tuner goal_tuner; + unsigned int fail_charge_num; + unsigned int fail_charge_denom; }; static struct damon_sysfs_quotas *damon_sysfs_quotas_alloc(void) @@ -1663,6 +1665,48 @@ static ssize_t goal_tuner_store(struct kobject *kobj, return -EINVAL; } +static ssize_t fail_charge_num_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_quotas *quotas = container_of(kobj, + struct damon_sysfs_quotas, kobj); + + return sysfs_emit(buf, "%u\n", quotas->fail_charge_num); +} + +static ssize_t fail_charge_num_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_quotas *quotas = container_of(kobj, + struct damon_sysfs_quotas, kobj); + int err = kstrtouint(buf, 0, "as->fail_charge_num); + + if (err) + return -EINVAL; + return count; +} + +static ssize_t fail_charge_denom_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_quotas *quotas = container_of(kobj, + struct damon_sysfs_quotas, kobj); + + return sysfs_emit(buf, "%u\n", quotas->fail_charge_denom); +} + +static ssize_t fail_charge_denom_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_quotas *quotas = container_of(kobj, + struct damon_sysfs_quotas, kobj); + int err = kstrtouint(buf, 0, "as->fail_charge_denom); + + if (err) + return -EINVAL; + return count; +} + static void damon_sysfs_quotas_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_quotas, kobj)); @@ -1683,12 +1727,20 @@ static struct kobj_attribute damon_sysfs_quotas_effective_bytes_attr = static struct kobj_attribute damon_sysfs_quotas_goal_tuner_attr = __ATTR_RW_MODE(goal_tuner, 0600); +static struct kobj_attribute damon_sysfs_quotas_fail_charge_num_attr = + __ATTR_RW_MODE(fail_charge_num, 0600); + +static struct kobj_attribute damon_sysfs_quotas_fail_charge_denom_attr = + __ATTR_RW_MODE(fail_charge_denom, 0600); + static struct attribute *damon_sysfs_quotas_attrs[] = { &damon_sysfs_quotas_ms_attr.attr, &damon_sysfs_quotas_sz_attr.attr, &damon_sysfs_quotas_reset_interval_ms_attr.attr, &damon_sysfs_quotas_effective_bytes_attr.attr, &damon_sysfs_quotas_goal_tuner_attr.attr, + &damon_sysfs_quotas_fail_charge_num_attr.attr, + &damon_sysfs_quotas_fail_charge_denom_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_quotas); @@ -2780,6 +2832,8 @@ static struct damos *damon_sysfs_mk_scheme( .weight_nr_accesses = sysfs_weights->nr_accesses, .weight_age = sysfs_weights->age, .goal_tuner = sysfs_quotas->goal_tuner, + .fail_charge_num = sysfs_quotas->fail_charge_num, + .fail_charge_denom = sysfs_quotas->fail_charge_denom, }; struct damos_watermarks wmarks = { .metric = sysfs_wmarks->metric, -- 2.47.3